Propeller



u 9, 1931- I E. R. MAISON 1,809,131

PROPELLER Filed June 3, 1929 INVENTOR. A 7 040! $713 2:

Patented: June 9 1931 I I I I j, 1 I I V Y l PATETQF-FICE i V rnornnmm I RP iGEtiOII filed'June 3, 1 32 9; Seei1V.

My invention relates to a new and useful wardly therefrom formed. concave as at 13, improvement in a'propelleradapted for use thus affording the desired strength on the e on boats, aeroplanes and similar vehicles for blade at the position of mounting and at the propelling purposes and also for use asa fan same timedishingout the face to provide a. or draft producing agent. I pocket 'for increasingthe efficiency vof the It is an object of the present invention to blade. .It will be noted from Fig. '1 that the provide apropeller which may be easilyand blades are extended across the rotating axis I quickly constructed and, which willoperate' insucha Way as 'to cross eaeh'otheratsubv with a maximum'efiiciency. stantiallyright angles and that each ofthe a Another object of'the invention is the problades determinesa single plane, that is,the I *29 reference to the accompanying drawings ture'shown but-desire toavail myselfofsuch 1 vision of a propeller having theblades so are blades are not of a twisted or spiral construc- I I g ranged relatively to the rotatingaxis that a tion so that each of the blades, allowing, of f 7 maximum area will be directly exposed to the course, for its thickness, may be considered 'ag medium in which the plate is rotating. planar body. It will also be nOted-thatWhiIer 15' Other objects will appear hereinafter. I the blades are extended across each other they e The invention consists in the combination do not overlapthe adjacent edges. i

and arrangement of parts hereinafter de- While I have illustrated and describedjthe i e and Claimedpreferred form of my invention, 1- do not wishf i 7 The invention will be best understood by a to limit myself to the precise details of strucwhich form a part of this specification and in variations and modifications as come within which, I I the scopeof the appended claims. I v V V Fig. 1 is a side elevational view of the. in- Havingthus described my invention, what vention. 1 f I claim as new and desire to secure byLetters 25 Fig. 2 is aview of Fig. 1 rotated ninety d e-v Patent is: j I g l grees. f .1. Apropeller'of the class described com Fig. 3 is an end elevational View of the in-' prising: a hub determinin the axis of rotavention. I v tion;v a pair of propeller b ades mounted on Fig. 4 is a sectional view taken on line 4- l said hub at aninclination to-the axis of rota- I so of Fig. 3. i a g e tion,"said' blades-being extended across said 9 i In the invention there is provided a'hub 7 axis in planes at substantially" right angles on which are fastened the propelling'blades. to each other and crossingsaid axis-at'a line In the drawings, I'have illustrated a pair of other than the transverse medial line of said these blades, each comprising the-major outblades, each of said blades being a planar 35 wardly projecting portions 8 and 9 and the body. T .i a j j minor outwardly projecting portions 10 and Y 2. A propeller ofthe class'described-com f 11 so that the blades are positioned. on the prisingz a hub determining the axis of rotarotating axis in'such a way that the rotating tion; a pair of propeller blades mounted on axis does, not pass through the transverse said hub atan inclination to the axis or rota; Y v to medial linelof the blades. These blades are tion, said blades being extended across said also positioned on the axis at an angle. c axis in planes at substantiallyright anglesto This location of the blades at the angueach other, and crossing said axis at a line Q larity and in the position relative to the 'meother than the transverse medial line of said dial line, described is adopted in order to problades,the faces of said blades being concaved L3 vide a propeller of maximum efficiency as it intermediate their ends,themain body of each presents, when the propeller is rotated, a i of said blades lying in'a single plane. Y maximum area to the medium in which the In testimony whereof-I have signed the f blade is rotated. I foregoing specification. e i

As shown in Fig.4, the base 12 of'the blade J is quite thick and the face proceeding out- 7 a I I -7 

